نتایج جستجو برای: roc curve

تعداد نتایج: 134739  

2005
Sofus A. Macskassy Saharon Rosset

This paper is about constructing and evaluating pointwise confidence bounds on an ROC curve. We describe four confidencebound methods, two from the medical field and two used previously in machine learning research. We evaluate whether the bounds indeed contain the relevant operating point on the “true” ROC curve with a confidence of 1−δ. We then evaluate pointwise confidence bounds on the regi...

Journal: :Biometrics 2007
Roger M Harbord Jonathan J Deeks Matthias Egger Penny Whiting Jonathan A C Sterne

Studies of diagnostic accuracy require more sophisticated methods for their meta-analysis than studies of therapeutic interventions. A number of different, and apparently divergent, methods for meta-analysis of diagnostic studies have been proposed, including two alternative approaches that are statistically rigorous and allow for between-study variability: the hierarchical summary receiver ope...

Journal: :Lifetime data analysis 2008
Margaret S Pepe Yingye Zheng Yuying Jin Ying Huang Chirag R Parikh Wayne C Levy

Receiver operating characteristic (ROC) curves play a central role in the evaluation of biomarkers and tests for disease diagnosis. Predictors for event time outcomes can also be evaluated with ROC curves, but the time lag between marker measurement and event time must be acknowledged. We discuss different definitions of time-dependent ROC curves in the context of real applications. Several app...

2007
Subhashis Ghosal

There are various methods to estimate the parameters in the binormal model for the ROC curve. In this paper, we propose a conceptually simple and computationally accessible Bayesian estimation method using a partial likelihood based on ranks. Posterior consistency is also established. We compare the new method with other estimation methods and conclude that our estimator generally performs bett...

Journal: :Physics in medicine and biology 2006
D P Chakraborty

In imaging tasks where the observer is uncertain whether lesions are present, and where they could be present, the image is searched for lesions. In the free-response paradigm, which closely reflects this task, the observer provides data in the form of a variable number of mark-rating pairs per image. In a companion paper a statistical model of visual search has been proposed that has parameter...

Journal: :Journal of chemical information and modeling 2011
Alfonso Pérez-Garrido Aliuska Morales Helguera Fernanda Borges M. Natália D. S. Cordeiro Virginia Rivero Amalio Garrido Escudero

There are several indices that provide an indication of different types on the performance of QSAR classification models, being the area under a Receiver Operating Characteristic (ROC) curve still the most powerful test to overall assess such performance. All ROC related parameters can be calculated for both the training and test sets, but, nevertheless, neither of them constitutes an absolute ...

1999
SIMON J. MASON NICHOLAS E. GRAHAM

The relative operating characteristic (ROC) curve is a highly flexible method for representing the quality of dichotomous, categorical, continuous, and probabilistic forecasts. The method is based on ratios that measure the proportions of events and nonevents for which warnings were provided. These ratios provide estimates of the probabilities that an event will be forewarned and that an incorr...

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